... thermal overload relay 3UA thermal overload relay can be used with 3TF/3TB contactor,also can be installed as single unit.3UA thermal relay series are suitable for overload ... to protect AC three-phase asynchronous motor against overload and open-phase. The current setting value ... 55~80, 63~90, 80~110, 90~120, 110~135, 120~150, 135~160, 150~180 3UA66 400 ... 1000 320~500, 400~630 3UA thermal overload relay